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Koshikawa, M. K., National Institute for Environmental Studies, Tsukuba, Japan, mkanao@nies.go.jp
Watanabe, M., National Institute for Environmental Studies, Tsukuba, Japan, watanabe.mirai@nies.go.jp
Shin, K. C., National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, shin-kch@aist.go.jp
Takamatsu, T., National Institute for Environmental Studies, Tsukuba, Japan, takamatsu.takejiro@nies.go.jp
Hayashi, S., National Institute for Environmental Studies, Tsukuba, Japan, shayashi@nies.go.jp
Nakano, T., Research Institute for Humanity and Nature, Kyoto, Japan, nakanot@chikyu.ac.jp

CONTRIBUTION OF VOLCANIC ASH ON BASE CATION CYCLES IN THE MT. TSUKUBA FOREST ECOSYSTEM OF KANTO, JAPAN AS INTERPRETED BY STRONTIUM ISOTOPES.

The sources of base cations in Japanese forest ecosystems have been assumed to be sea salt, bedrock, and Kosa (Asian dust). Volcanic ash may also be an important contributor of base cations in volcanic areas. However, the contribution of “volcanic ash-derived” base cations on plants and stream waters has been poorly quantified. Previous studies have revealed that Sr acts as an analog for base cations in the majority of forest ecosystems processes. The 87Sr/86Sr ratios of bulk precipitation, throughfall, soil, plants, and stream water were measured at the ridge, in the middle, and at the base of a valley in Mt. Tsukuba, Japan. The proportion of volcanic ash-derived Sr was estimated for each sample. More volcanic ash was found near the ridge than in middle or at the base, and plants from the ridge contained more volcanic ash-derived Sr than plants from the middle or the base. Upstream water contained more volcanic ash-derived Sr than downstream water. The amount of volcanic ash depended on the topography of the site and influenced the source composition of Sr in the studied ecosystem.

Poster presentation

Session #:SS42
Date: 7/12/2012
Time: 18:00 - 20:00